v2.0 prep - FINAL REVIEW

This is the monster diff of all 2.0 work in one place. The work consists of, in much more manageable chucks, the following:
- armstrong/armstrong.dev#11
- armstrong/armstrong.dev#12 
- armstrong/armstrong.dev#13
- switching Fabric to Invoke (3ee5af2c14cec643ba8064b53835a21d4163798f)
- about 7-8 other commits since Feb 5th on this branch

Left to do:
- [x] explore the Django 1.7 alpha
- [x] README and CHANGES updates
- [x] use this "final form" to test a bunch of different Armstrong components for sanity checking

This will merge to a branch in the main repo and from there to master where it'll become the new 2.0 release.